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well! im having some problems in solving the following problem:

"A grating that has 800 lines per mm, the red light of the Balmer series for the Hydrogen atom has a wavelength 6563 angstrom.

(a)What is "d" for the grating expressed in meteres.

(b)If the grating was 1cm what is N?

(c)At what angles would you expect to observe this wavelength?

Well, i have tried to solve the "a" part but i just cant understand the "b" & "c" part. Plz help me.

Thanks in advance

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# Homework Help: Plz Help me in solving this Diffraction Grating Problem

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